I drew up plans a while back for a Sebiestor tribal corp, but never launched it due to all sorts of reasons.
While at first glance the Minmatars might seem to have all sorts of love and unity, I don't know that that really rings true upon deeper examination.
From an OOC perspective: well, "death to the slavers" sure makes for a really useful handle for new RPers, and it has enough of a compelling quality even to maintain the interest of some experienced RPers. Plus, the obvious "excuse" it provides for lots of pew.
But even IC: okay, so you have the Big Bad just across the way, and capsuleers doing the EVE equivalent of the Battle of Britain to keep it out. Now, back in the Republic, we have a huge change in form of government (parliamentary -> tribal republic), some giant sekrit project out in the wildlands, and likely tons of behind-closed-doors scheming. Nobody wants outsiders to know about it, of course, because the Empire would try again to infiltrate and take advantage of that, but likely six of the seven tribes (excepting <em>maybe</em> the Starkmanir ) have all sorts of little plans working.
And let's not forget the much-neglected nexus between the RSS, the Angel Cartel, and the Thukkers. I seem to recall some hints that the boundaries occasionally get murky, and the Angel epic arc seems to refer to that as well.
* Casiella takes a breath so as not to monopolize the thread.